The 289 HiPo had a solid lifter cam and a 4 bbl carb. A solid lifter cam needs an adjustable valve train. I would not be surprised if it had a higher compression ratio, also. This total combination was rated at 271 HP. Anybody can throw on a 4bbl combination on a 289 (or a 302 for that matter)and get a boost of power, but it's not a 289 Hipo. They are somewhat rare, so if you have one KEEP IT. As far as tuning a non 289 HiPo, it's fairly straight foward. You have points, condensor, cap, rotor, plugs, wires, etc. Probably the only difference in tuning would be the adjustable valvetrain that the HiPo would have. Hope that helps.
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